Improvement in valve-gear



' a manner that the oscillating motion of thc link is inaient @time ARTHUR ALLEN. OF NEW YORK, N. Y.

Lette/rs Patent No. 91,060, dated .Time 8, 1869.

IMPROVEMENT IN VALVE-GEAR.

The Schedule referred to in these Letters Patent and making pan: f the same. y

To all whomgit may concern.-

Beit known that I, ARTHUR M. ALLEN, of the city, county, and State of New York, have invented a new and improved Valve-Gear; and I do hereby declare the followingr to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which drawing- Figure 1 represents a side View of this invention.

Figure 2 is a plan or top view thereof, partly in section. v i

Figure 3 is a transverse vertical section of the same.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of a sliding bar,carryin g a guide for a carriage, from which extends a pivot, through a slotted link, into the end of the rod impart-ing motion to the slide-valve of a steam-engine, said link being made to oscillate by a single eccentric on a stationary central pivot, in such tercepted by the carriage, and transmitted to the valve without compelling the reversing-lever to move, and thereby a valve-gear is obtained, which is operated by a single eccentric and a single link, and which allows of reversing the engine with the greatest ease and facility.

j- 'lhe letter A designates a slotted link, which oscillates on a pivot, a, secured in a stationary bracket, l, said pivot being attached to a` bridge, c, which extends across the slot of the link, V'sothat itdocsnot interfere with the motion of the pin d in the slot of the link.

rlhis pin extends from a carriage, e', into the rod j, which transmits Vmotion to the valve-rod g, and through it to the valve enclosed in the steam-chest B.

The carriage e is tted on a guide, 71, which extends from a slide-bar, t', in a direction transverse to the link A, andthe slide-bar t connects, by a link, j, elbow-1ever k, and rod l, with the reversing-lever.

- The link A connects, by a rod, O, with an eccentric,

D, so that by the revolution of said/ eccentric, an oscillating motion is imparted to the link.

If the pin d is moved in the link A, to the position shown in iig. 1 of the drawing, right under the pivot a, the valve receives no motion; but if ,said pin is moved, by the action of the reversing-lever, toward' either end of the link, the oscillating motion of said link is transmitted to the valve, and the engine runs in one direction, if the pin l is moved below, and in the opposite direction, if the pin el is moved above the pivota..

But if the pin (l should be connected rigidly to the end of the rod l, or any other rod or lever connected to the reversing-lever, the link would either not be able to oscillate whenever said pin should be .moved toward one or toward the other end of the link, or the oscillating motion of the link would also be transmit-ted to the reversing-lever.

This didcnlty I have overcome by connecting the pin rl to a carriage, c, which is suppoited by the slidebar t, said carriage being capable of' moving in a direction transverse to the slot ofthe link.

If the pin d, in my valve-gear, is moved from 'under the pivot a of the link, the carriage e. is caused to slide back and forth on its guide h, by the oscillating motion of the link, and the reversing-level' can remain stationary while the full motion of the link is transmitted to the valve.

Having thns described my invention, i

lVhat I- claim as new, and desire to secure by ters Patent, is

Thecarriage e, guide h, and slide-bar i, in combination with the pin d, sliding in the link A, and transmitting its motion to the Valve, substantially as herein shown and described.

ARTHUR M. ALLEN.,

Witnesses:

W. HAUFF, ERNEST F. KASTENHUBER. 

